diff --git a/h8r/TODO.md b/h8r/TODO.md
index e232842..552ab52 100644
--- a/h8r/TODO.md
+++ b/h8r/TODO.md
@@ -1,10 +1,11 @@
 - [x] server on fixed port responding "oh no"
-- [ ] configurable port and working directory
+- [x] configurable addr
 - [ ] string responses
 - [ ] error page paths
 - [ ] serve "index.txt" file if exists, else 404
 - [ ] serve relative paths with mime type text/plain
 - [ ] guess mime type
+- [ ] configurable working directory
 - [ ] automatic directory index
 - [ ] content ranges
 - [ ] liquid template rendering
diff --git a/h8r/src/main.rs b/h8r/src/main.rs
index 47ee049..2a206c9 100644
--- a/h8r/src/main.rs
+++ b/h8r/src/main.rs
@@ -1,6 +1,21 @@
 use std::io::Write;
 use std::net::{Shutdown, TcpListener};
 
+fn main() -> std::io::Result<()> {
+    let addr = std::env::var("H8R_ADDR").unwrap_or("127.0.0.1:17321".to_string());
+    let listener = TcpListener::bind(&addr).unwrap();
+
+    eprintln!("h8r: listening at {}", addr);
+
+    for stream in listener.incoming() {
+        let mut stream = stream.unwrap();
+        handle_conn(&mut stream)?;
+        stream.shutdown(Shutdown::Both)?;
+    }
+
+    Ok(())
+}
+
 fn handle_conn(stream: &mut impl Write) -> std::io::Result<()> {
     eprintln!("attempting to respond");
 
@@ -17,18 +32,6 @@ fn handle_conn(stream: &mut impl Write) -> std::io::Result<()> {
     Ok(())
 }
 
-fn main() -> std::io::Result<()> {
-    let listener = TcpListener::bind("127.0.0.1:17321").unwrap();
-
-    for stream in listener.incoming() {
-        let mut stream = stream.unwrap();
-        handle_conn(&mut stream)?;
-        stream.shutdown(Shutdown::Both)?;
-    }
-
-    Ok(())
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;